A study suggests that the Earth’s interior hides the remnants of another planet

Study shows that smoking 'stops' cancer-fighting proteins, causing cancer and making it harder to treat

Earth is Hiding Another Planet Deep Inside

Icy Oceans Exist on Far-Off Moons. Why Aren’t They Frozen Solid? The moons orbiting Jupiter and Saturn appear to have subsurface oceans — tantalizing targets in the search for life beyond Earth. But it’s not clear why these seas exist at all.